Loom-stopping mechanism



3 Sheet-Sheet 1 Filed July 26. 1927 ATTORNEY Oct. 9, 1928 1,687,471

H. A. DAVIS LOOM STOPPING MEQHANISH Filed July 26, 1927 s sums-sheet 2 ATTORNE H. A. DAv|$ LOOM STOPPING MECHANISM 3 Sheets-Sheet Filed July 26, 1927 TOR.

7 41 l/EN ATTORN Y Patented Oct. 9, 1928.

UNITED STATES PATENT Q F Flca HARRY A. DAVIS, OF HOPEDALE,,MASSACHUSETTS, ASSIGNOR TO DRAPER-CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

} Loon-STOPPING MECHANISM.

Application filed July 26,

This invention relates to loom stopping mechanism and is more particularly directed to means for effecting loom stoppage on the occurrence of a warp fault.

It is now the ordinary practice to provide looms with means for stopping the loom upon the occurrence of a warp fault, such as a broken or too slack warp thread, in order that position of the shuttle and see that the shut- I tle is in the proper box when he has turned 'the loom over. This frequently necessitates movement of the shuttle in the shed by hand and much time is wasted inthus positioning the warp threads and the shuttle afterthe loom has been stopped so that the attendant may correct the warp fault. p One of the objects of thepresent lnventlon is to provide loom stopping means which will act upon the occurrence of a warp fault to stop the loom with the shuttle always in the same box, preferably at the shipper sideof the loom, and with the shed closed or substam tially closed, thereby relieving the loom attendant of any necessityof turning the loom over by hand to properly position the parts and the warp threads for piecing up.

In accordance with the'present invention, the warp stopping mechanism is of the transversely movable toothed bar type in which the toothed detector bar is given its detecting movement on every other beat-up movement of the layor every other pick of the shuttle. and means are under control of the warp stop mechanism to throw off the power from the loom by frontward movement of the lay when the shuttle is absentfrom the box at the shipper side of the loom, so that the momentum of the loom may carry the lay to its full back position to cause the return. of the shuttle to the box at the shipper side of the loom and come to rest with'the lay between front and back position, with the shuttle in 1927. serial No.:208,495.

the shed closed or substantially closed, which is the most advantageous" position of the warp threads for piecing up. i v

The invent-ion and new combination of parts will best be made clear from the following description and the accompanying drawings of one good form thereof.

In the drawings I Fig. 1 is a perspective View of portions of aloomatthe shipper side thereof and provided with the present invention;

-Fig. 2 ma side sectional elevation on a somewhat enlarged scale showing the relation of parts when the warp stop mechanism has detected a fault in the warp'threads and positioned the dog for operation by frontward movement of the lay;

Fig. 3 an enlarged elevation showinga portion of a transversely movable toothed detector bar warp stop mechanism; and

Fig. 4 is a'detached detail inside elevation showing a loom provided with the present invention.

The loom frame 1 may be of usual construction, and mounted in suitable bearings at each side of the loom frame is the crank shaft 2 connected by the crank 3 to the pitman/l connected at 5 to th'elay 6, whereby the, lay

is given its usual movements.

Mounted on the crank shaft is the gear 7 which meshes with the gear 8 mounted on the cam shaft 9 below the crank shaft, the size of the gears 7 and 8 being such as to impart to the cam shaft one revolution to each two revolutionsof the crank shaft.

Mounted on the crank shaft 2 are the fast and loose pulleys'10 and 11 and a brake drum 12. The crank shaft 2 is given its rotary movements by means of a belt-13, Fig. 1, which passes through the loop of a belt shifter 14 whereby the belt may be shifted from one pulley to the other. 7

Mounted on the loom frame is the bridge member 15 which may afford a convenient support for one, end bearing of the) crank shaft 2,'andrsuch bridge member is connected to the, loom frame by the bars 16 and 17. Mounted on the bar 17 Fig. 1, is the front end portion. 18 ofxthebelt shifter from which extends a pin 19 engaged witha slot 20 on the shifting arm 21 which may be pivoted at 22 to abracket 23secured totheloom frame.

The frontwardly extending end portion 24 of the belt shifter is engaged with the lower end portion 25 of the shipper lever'26 pivotally mounted at 27 to the bracket 28 extending from the loom frame. The upper end of the shipper 26 isprovided with the usual ferred from the fast to the loose pulley, as-

indicated in Fig.1.

Mounted on the stud 31 extendin g from the loom frame is the hub portion of the brake arm 32 having an upwardly extending toe 33 which is adapted to act through the block 34,

Fig. 1, and the rod 35 to apply the brake 36 to the brake drum 12. The shipper leyer26 is provided with a liftingt-oe 39 which under lies the frontward-ly extending portion of the each side of the loom.

brake arm 32, the construction being such that when the shipper is 1-11 running pos tion I the brake arm 32 will be lifted to relievethe brake.

Secured to the brake lever is the spring 40,7Fig. 1, which, when the shipper lever is detached from its holding notch, acts upon the brake arm 32 to apply the brake to the brake drum to thereby overcome the momentum of the loom when the shipper lever has shipped or transferred the belt from the fast to the loose pulley, as will be more fully explained. l

The warp stop mechanism, as hereinbefore stated, is of the transversely movable toothed bar type wherein movable andfixed toothed bars have relative transverse movement during loom operation and the movable toothed bar is brought to rest by a drop wire 41 when a warp fault occurs. In the present instance of the invention, the fixed toothed bar a2 is secured at its ends to a bracket 48, one at The .inovable toothed detecting bar 4 1- is connected by a link 45 to a bar actuator 46, the lower end portion of which has pins or fulcra 47 which rest in seats in the rocker 48, and a'spring 49 normally holds the toothed bar actuator in its normal position, as indicated in Fig. 3. The parts of the warp stop mechanism sofar described may besubstantially asshown and described in the Davis and Johnson Patent, No. 1,538,

625, dated May 19, 1925.

Pivotally mounted on the rocker 48 at 50 is the stop finger 51 which normally bears upon a lever 52 pivotally mounted at 53 on the rocker 48, and the inner end portion of the stop finger 51 has a pin 54 which enters a slot 55 in the bar actuator, theeonstruction being such that should the bar actuatorbe arrested in its movement by a drop wire, the inner'end of the stop 'finger will be lifted to depress he lever 52 to effect loomstoppage. p

"The rocker 48 is connected with the shaft 56 which is itself connected to an arm 57 actuated from the lower .or cam shaft 9. through the link connections 58 and 59.

As hereinbefore stated, the transversely movable detector bar is given its detecting movements once on each two beat-up move- 111611118 of the lay or each, alternate pick of the shuttle, and as a convenient means to this end the-link 59 is provided with a yoke 60, thebifurcated end of which straddles the l0W- er or cam shaft 9 to guide the link 59 in its up and down movements. Mountedon the loweror cam shaft 9 is the link actuator which comprises two cams 61 and 62 each of which has a groove, preferably formed as face cams, toengage a switch 63 .pivotally mounted on the yoke (3O at (let. The cam 61 which in the present instance of the invention is the cam for lifting the link 59, has a switch control= ling portion 65 for throwing the switch 63 so that it will engage first one cam andthen the other, the cam 62being the cam for drawing down the link 59.

Each of the cams 61 and 62 has a. dwell portion a and b,ras represented by thearrows,

Fig. 2, and after the active portion of either camhas moved the transversely movable detecting bar, such bar will dwell for substantially a half revolution of the lower or cam shaft,,and since the lower or cam shaft makes one revolution to each two revolutions of the crank shaft, it follows that a detecting move ment of the detector barwill occur in one or the other direction on alternate movements ofthe lay, or, in other words, on alternate revolutions of the crank shaft.

The warp stop mechanism, as hereinbefore describechFig. 8, is connected by a train of mechanism to a dog at the front of the loom, which is mounted on the shipper knock-off, so that upon the occurrence of a warp fault, the dog-will be placed inthe path of a hunter mounted on the lay to cause the shipper to be knocked off as the lay moves front-ward, whereupon the beltshifter transfers the belt is simultaneously applied to effect final stoppage of the lay after it has knocked off the shippe ggone. to its back position to permit the shuttle to be picked to the box at the shipper side of the loom, and has finally stopped closed and the shuttle is in the boX at the shipper side ofthe loom.

"Pivotally mounted on a pin 66 is the shipfrom the fast to the loose pulley and the brake per knock-off 67 the end 68 of which bears 1 against the front of theshipper lever 25. 'Pivota lly connected to the shipperknock-otf 67 at 69 is the rearwardly extending dog 70 whichfrests upon a plunger or pin 71'carried by a'casing 72inountedon the lower extended portion 78 of the shipper knock-Om The plunger 71 is connected'bya flexible sheathed Wire 74: to a corresponding plunger 01' pin 75 normallyresting against the end of the-lever 52 of the warp stop mechanism, Fig. 3, under the influence of aspring 7 6; The construction issuch that should the transversely movable detector bar on one of its movements during alternate beat-ups of the lay be arrested by a drop wire, the sheathed wire 74 will be moved endwise in the sheath to lift the dog from its dotted to its-full line position, Fig. 2, so that as the lay moves frontwardly, the bunter 77 which is mounted upon the lay will strike the dog and knock off the shipper as the lay moves frontwardly. 'As the shipper is thus knocked off, the belt will be shifted from the fast to the loose pulley and the brake will simulta neously be applied to arrest the lay only after it has gone to its full back position to enable the shuttle to be picked into the box at the shipper side ofthe loom and finally bring the loom to rest with the lay in about one-third front position.

Since the dog 70'and' the sheathed wire actuating plunger 71 are mounted upon the downwardly extended portion of the shipper knock-oft, they will retain their normal relation even when the shipper knock-off is actu- 'toothed detecting bar is given a detecting movement on each alternate beat-up: movement of the lay and should the movement of the detecting bar be arrested by a drop wire as the lay moves frontwardly, the dog 70 which is under the control of the warp stop mechanism, will be raised into the path of the hunter 77 secured to the lay and through the shipper knock-off act to disconnect the loom from the power actuating means, and under the momentum of the loom parts the lay will make its fullback movement, so that the shuttle which was absent from the box at the shipper side of the loom when the power was removed therefrom, will be returned to the box at the shipper side of the loom and the brake will. act to stop the loom with the lay between its back and front position, with the shuttle in the box at the shipper side of the loom and the shed closed or partially closed, which is the most convenient position of the warp threads for piecing up by the loom attendant. When the loom is set up ready to start weaving care should be taken to see that the shuttle is placed in the proper box, whereupon the loom will always be stopped with the shuttle in the same box and the shed closed or substantially closed. This will relieve the loom attendant of the duty of turning the loom over by 'hand,'sothat such atteiidant caii run more looms than heretofore with resultant greater production in cloth.-

Should itbe desirable at any time to turn the'loom over by hand for any reason after it has been stopped, this can easily be done by means of the hand-piece 80, Fig. l, which has connected therewith the finger 81 connected to the upper end 82 of a reach rod 37 which passes through an opening 38 in the brake arm 32. But owing to the fact that the loom is always stopped as hereinbefore described, such hand manipulation of the loom is seldom required. i r

What is claimed is: r

1. In a loom, the combination of the lay and shuttle boxes, a Warp stop mechanism having a transversely movable toothed detector bar constructed so that its movement in either direction will effect loom stoppage upon detecting a displaced drop wire, means for imparting a transverse detecting movement to the bar only on alternatebeat-up movements of the lay, a series of drop wires normally supported by the warp threads during weaving, a shipper knock-off dog at the front of the loom under control of the warp stop mecha nism, a hunter carried by the lay to engage the dog on the occurrence. of a warp fault upon an alternate frontward movement of the lay that theloom may be brought to rest with the shuttle always in the same box.

2; In a loom, the combination of the lay and shuttle boxes, a warp stop mechanism having a transversely movable toothed detecting bar, means for imparting a detecting movement to the toothed bar in either direction only on alternate picks of the shuttle, a

shipper, a shipper knock-off dog at the front of the loom, a hunter oirtlie lay for operating the dogon frontward movement of the lay to knock off the shipper, connections between the warp stop mechanism and knockoff dog for positioning the dog for engagement by the hunter upon'the occurrence of awarp fault on one of the alternate picks of the shuttle, and means for bringing the loom to rest with the lay between its back and front positions and the shuttle always in the same shuttle box.

8. In a loom, the combination of the lay and shuttle boxes, a warp stop mechanism hav ingfa transverselymovable toothed detecting bar, means for imparting a transverse detecting movement to the detecting bar in either direction only on each alternate pick of the shuttle. a shipper, a shipper knock-off dog" at the front of the loom under control of the warp stop mechanism, a hunter on the lay for operating the dog on frontward movement of the lay to knock-off the shipper when the shuttle is absent from the box at the" liar shipper -side of the m, and-means for bringing the loom to restwhenthe shuttle is able detector, means for imparting a detecting movement to the detector in either of its traverse movements only on alternate picks of the shuttle, a shipper for transferring the belt from one pulley to the other, a shipper knock-off dog at the front of the'loom under control of the warp stop mechanism, a hunter on the lay acting through the dog on'frontward movement of the layto knock off the shipper and transfer the belt from the fast to the loose pulley, and means operative to bring the loom to rest after the knock-off and the lay has gone back and been advanced to shed closed position with the shuttle always in the same box at the shipper side of the loom after the shipper has been knocked off.

5. Ina loom, the combination of the lay and shuttle boxes, a warp stop mechanism having drop Wires and a transversely ,movable toothed detector bar, means for imparting transverse detecting movement to said bar in either direction only on every other ick of the shuttle, a shipper, means controlled by the warp stop mechanism for knocking off the shipper by frontwardmovement of the lay when the shuttle is absent from the box at the shipper side of the loom, and means for bringing the loom to rest with the shed closed when the shuttle has been returned to I the shuttle box at the shipper side of the loom that the loom by momentum of the loom may be stopped by the warp stop mechanism with the shuttlealways in the box at the shipper side of the loom.

6. In a loom, the combination of the lay and shuttle boxes, a warp stop mechanism having drop wires and a transversely movable toothed detect-or bar, means including a .switch cam for imparting a detecting. movementnni of theloom has caused the shuttle to I be returned tothe shuttle box at the shipper side of the loom. r

7. In a loom, the combination ofthe lay and'sliuttle boxes, a warp stop mechanism having drop WlI'S,'L transversely movable toothed detector bar, means for imparting; a

transverse detecting movement to saidbar only on every other pick of the shuttle, a

shippenaknock-01f lever, a dog pivotally acting after the looinhas been freed from, power operation for bringing the loom to rest onlyafter the loom momentumhas carriedthe lay to its back position and then frontward to an mtermediate positionand the shuttle has been picked'that the, shuttle may always be in the box at :the shipper side of the loom when the loom is stopped and the shed besubstantially closed. I

8.7In a loom, the combinatlon ofthe lay and shuttle boxes, a warp stop mechanism 5 having drop wires and'a transversely movable toothed detector bar, means for imparting transverse detecting movement tothe bar only on every other pick of the shuttle, a shipper, a knock-offlleverpa dog pivotally connected to the knock-off lever, azbunter on the lay, means controlled by detection of'a warp fault for positioning the dog for engagement by the bunter on frontward movement of the lay only whenthe shuttle is absent from the box at the shipper side of the loom, and means operable to stop the loom only after its momentum has carried the lay to its back position and frontward to an in termediate position and shuttle has been picked that the shuttle may be returned to the box at the shipper side of the loom when the loom is finally stopped.

9. In a loom, the combination of the lay and shuttle boxes, a driving belt-and fast and loose pulleys for controlling the loom operation, a belt shifter, warp stop mechanism including drop wires and a transversely movable toothed detector bar, means for imparting a transverse detectingmovement to the bar only on alternate picks of the shuttle, a shipper for transferring the belt from onepulley to the other, a shipper knock-off, a ,dog ,pivotally connected to the shipper knock oii' and operativelypositioned onthe occurrence of a warp fault when the shuttle isabsent from the box at the shipper side of the loom, a hunter on the lay actingtnrongh the dog on frontward movement of the lay to knock off. the shipper and transfer the belt from the fast to the loose pulley, and means operable to stop the loom only after its monientuinhas carried the lay to its back position and forward thereof and the shuttle picked that the shuttle may always be in the box at the shipper sideof the loom when the looinis stopped. v I

10. in a loom, the combinat on of the lay and shuttle boxes, a warp stop mechanism having a transversely movable toothed de.

tector bar, means for shifting the toothed bar back and forth and for holding the bar at each end of its stroke during one beat-up so that the-bar is shifted only on alternate beatup movements of the lay, a series of drop the lay to engage and shift the shipper knocle 1 off on the occurrence of a warp fault upon an alternate frontward movement of the lay that the loom may be brought to rest with the shuttle always in the same box.

In testimonywhereof, I have signed my name to this specification.

HARRY A. DAVIS. 

